Eating lemon for a cold is useful and effective for a mild cold. Because lemon is rich in vitamin C, which is an essential reducing agent for the body and participates in many cellular metabolic reactions, it can promote the body’s clearance of pathogenic microorganisms. However, for heavy colds, the effect of eating lemon alone is general, you should also use anti-cold drugs, more commonly used are Pudilan Oral Liquid, Compound Aminophenalkylamine Granules, Lianhua Qingfei Capsules, etc.. During the treatment period, you should drink more water and eat more vegetables and fruits. At the same time, avoid excessive exertion, especially not to stay up late, reduce going out and do not go to crowded places.